Go-style defer without dependency injection

go-defer.js

var deferrable = function (cb) {     
  
  function getFunctionBody(code) {
    var functionDef = code.match(/\{(.|[\r\n])+\}/);
    // Strip body of all useless chars
    return functionDef[0].replace(/\{|\}/g, '')
  }

  var 
      // Grab the entire defer() block
      deferCode = cb.toString().match(/defer\((.|[\r\n])+\}+\)/),
      // Grab the deferred function's body
      functionBody = getFunctionBody(deferCode[0]),
      toDefer = new Function(functionBody);
  
  // Strip out the defer call
  cb = new Function(getFunctionBody(cb.toString().replace(deferCode[0], '')));
  
  cb();
  toDefer();
}

deferrable(function () {
  defer(function () {
    console.log('bar');
  })
  console.log(2);
});

Hey, FYI, I've created a lib for this, feel free to criticize and report issues 😃
https://github.com/JsCommunity/golike-defer

Well it's not exactly the same because I do use dependency injection.